PDF malware analysis — malicious · f033e66243f408a4

MALICIOUS

PDF

40.4 KB Created: 2021-05-23 08:35:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04

MD5: faf682c56d54dd630c1c1cac2d7d2d35 SHA-1: dd88e2294d0e4b19a14bc86ce937ef60650898e6 SHA-256: f033e66243f408a4265c387a86d962cb38fb394517ab2896b44f38e5ecfff41d

180 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a malformed stream and links to known malicious redirector infrastructure, specifically advertising a "free Robux 2021 game hack". The embedded document body and heuristics indicate a lure to a potentially malicious website. The malformed stream suggests an attempt to exploit a PDF viewer vulnerability, likely leading to the execution of a second-stage payload.

Machine Learning

Nyx PDF Classifier malicious score 0.8786

Heuristics 5

PDF links to a 'free generator / game hack' redirector critical PDF_GAME_HACK_REDIRECT_LURE

PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK

PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH

A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON

Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
URL https://netcdn.xyz/app/431946152/free-robux-2021-game-hack In PDF document text
- http://innovativefs.co.uk/images/how-to-hack-roblox-for-robux_GM431946152.pdfIn PDF document text
- http://innovativefs.co.uk/images/minecraft-free-version_GM479516143.pdfIn PDF document text
- http://innovativefs.co.uk/images/como-hackear-coin-master-en-espaol_GM406889139.pdfIn PDF document text
- http://innovativefs.co.uk/images/2021-free-spins-coin-master_GM406889139.pdfIn PDF document text
- http://innovativefs.co.uk/images/coin-master-hack-apk-download-2021_GM406889139.pdfIn PDF document text
- http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`stream_002_off0000340f.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x340F	26120 bytes
SHA-256: `9433166f6faf106ec3127e07fca61d6ce1fd53ecfd01dafb61b4cef0bface194`
`font_01_sfnt_off00006f85.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6F85	3884 bytes
SHA-256: `40b61f8938bd710dc29dc58ba3fde91c245a6a69596ec569b4d27c769ca417cf`
`font_02_sfnt_off00007c2c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x7C2C	18416 bytes
SHA-256: `a2c808792aaeb1607b9c3a91ae122c662faffffe8d42f3cf4118be6ccc5b3e7b`

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